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Afforestation with an age-sequence of Mongolian pine plantation promotes soil microbial residue accumulation in the Horqin Sandy Land, China

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Journal of Arid Land 2024年第4期16卷 567-579页

作者： GUO Jingwen SONG Xueshu WANG Xiao DU Zhangliu LU Sen State Key Laboratory of Efficient Production of Forest Resources Research Institute of ForestryChinese Academy of ForestryBeijing 100091China Co-Innovation Center for Sustainable Forestry in Southern China Nanjing Forestry UniversityNanjing 210037China College of Resources and Environmental Sciences China Agricultural UniversityBeijing 100193China

Land use change affects the balance of organic carbon(C)reserves and the global C *** residues are essential constituents of stable soil organic C(SOC).However,it remains unclear how microbial residue changes over time following *** this study,16-,23-,52-,and 62-year-old Mongolian pine stands and 16-year-old cropland were studied in the Horqin Sandy Land,*** analyzed changes in SOC,amino sugar content,and microbial parameters to assess how microbial communities influence soil C transformation and *** results showed that SOC storage increased with stand age in the early stage of afforestation but remained unchanged at about 1.27-1.29 kg/m2 after 52 ***,there were consistent increases in amino sugars and microbial residues with increasing stand *** stand age increased from 16 to 62 a,soil pH decreased from 6.84 to 5.71,and the concentration of total amino sugars increased from 178.53 to 509.99 mg/kg.A significant negative correlation between soil pH and the concentration of specific and total amino sugars was observed,indicating that the effects of soil acidification promote amino sugar stabilization during *** contrast to the Mongolian pine plantation of the same age,the cropland accumulated more SOC and microbial residues because of fertilizer *** Mongolian pine plantation with different ages,there was no significant change in calculated contribution of bacterial or fungal residues to SOC,suggesting that fungi were consistently the dominant contributors to SOC with increasing *** results indicate that afforestation in the Horqin Sandy Land promotes efficient microbial growth and residue accumulation in SOC stocks and has a consistent positive impact on SOC persistence.

关键词： soil organic matter stand age biomarker amino sugars microbial residues

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Linkage of microbial living communities and residues to soil organic carbon accumulation along a forest restoration gradient in southern China

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Forest Ecosystems 2021年第4期8卷 765-777页

作者： Shuo Zhang Qi Deng Ying-Ping Wang Ji Chen Mengxiao Yu Xi Fang Hongbo He Jinlei Chen Pingping Xu Shenhua Wang Junhua Yan Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems South China Botanical GardenChinese Academy of Sciences510650 GuangzhouChina University of Chinese Academy of Sciences 100049 BeijingChina Department of Agroecology Aarhus University8830 TjeleDenmark CSIRO Oceans and Atmosphere PMB 1Victoria 3195 AspendaleAustralia Aarhus University Centre for Circular Bioeconomy Aarhus University8830 TjeleDenmark iCLIMATE Interdisciplinary Centre for Climate Change Aarhus University4000 RoskildeDenmark Faculty of Life Science and Technology Central South University of Forestry and Technology410004 ChangshaChina Institute of Applied Ecology Chinese Academy of Sciences110016 ShenyangChina

Background:Forest restoration has been considered an effective method to increase soil organic carbon(SOC),whereas it remains unclear whether long-term forest restoration will continuously increase *** large uncertainties may be mainly due to the limited knowledge on how soil microorganisms will contribute to SOC accumulation over ***:We simultaneously documented SOC,total phospholipid fatty acids(PLFAs),and amino sugars(AS)content across a forest restoration gradient with average stand ages of 14,49,70,and>90 years in southern ***:The SOC and AS continuously increased with stand *** ratio of fungal PLFAs to bacterial PLFAs showed no change with stand age,while the ratio of fungal AS to bacterial AS significantly *** total microbial residue-carbon(AS-C)accounted for 0.95-1.66% in SOC across all forest restoration stages,with significantly higher in fungal residue-C(0.68-1.19%)than bacterial residue-C(0.05-0.11%).Furthermore,the contribution of total AS-C to SOC was positively correlated with clay content at 0-10 cm soil layer but negatively related to clay content at 10-20 cm soil ***:These findings highlight the significant contribution of AS-C to SOC accumulation along forest restoration stages,with divergent contributions from fungal residues and bacterial *** clay content with stand age significantly affects the divergent contributions of AS-C to SOC at two different soil layers.

关键词： Soil carbon stock microbial biomass microbial residues Forest restoration Soil clay content Soil layer

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Linking microbial carbon pump capacity and efficacy to soil organic carbon storage and stability under heavy metal pollution

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Soil Ecology Letters 2023年第2期5卷 55-63页

作者： Xiao Liu Xia Xu Tian Ma Shiwei Zhou Xiaoli Bi Hongbo He Xudong Zhang Weihuan Li College of Agriculture Ludong UniversityYantai 264025China Department of Ecology Co-Innovation Center for Sustainable Forestry in Southern ChinaNanjing Forestry UniversityNanjing 210037China State Key Laboratory of Grassland Agro-ecosystems College of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhou 730020China Yantai Institute of Coastal Zone Research Chinese Academy of SciencesYantai 264003China Institute of Applied Ecology Chinese Academy of SciencesShenyang 110016China

Heavy metal pollution can lead to a great loss of soil organic carbon(SOC).However,the microbial mechanisms that link heavy metal pollution to SOC remain poorly ***,we investigated five apple-orchard soils at different distances from a Pb-Zn *** assessing the heavy metal pollution level based on Grade Ⅱ of the national soil environmental quality standard(China),we found SOC stocks and microbial carbon pump(MCP)capacity(i.e.,microbial residue carbon)under medium and heavy pollution levels were significantly lower than those under safe,cordon and light pollution *** structural equation model showed causality in the SOC variations linked to pollution level through MCP capacity,which could contribute 77.8% of the variance in SOC *** verified MCP capacity can serve as a key parameter for evaluation of SOC storage under heavy metal *** MCP efficacy,i.e.,the proportion of microbial residue carbon to SOC,also decreased under medium and heavy *** suggested that,with a heavier pollution level,there was a higher rate of reduction of microbial residue carbon in soil than the rate of reduction of *** MCP efficacy can be a useful assessment of SOC stability,the significantly positive relationship between MCP efficacy and clay content in correlation analysis implied that lower MCP efficacy was correlated with SOC stability under the heavier pollution *** study provides valuable insights to identify the mechanisms of microbially mediated C transformation processes that are influenced by heavy metal pollution in agroecosystems.

关键词： microbial residues Soil microbial carbon pump Carbonsequestration Heavy metals Agricultural soil

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The soil microbial Carbon Pump as a new concept for terrestrial carbon sequestration

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Science China Earth Sciences 2021年第4期64卷 545-558页

作者： Chao LIANG Xuefeng ZHU Institute of Applied Ecology Chinese Academy of SciencesShenyang 110016China

Soil is a huge terrestrial carbon pool, which has higher carbon storage than the sum of atmospheric and terrestrial vegetation carbon. Small fluctuations in soil carbon pool can affect regional carbon flux and global climate change. As soil organic carbon plays key roles in soil carbon storage and sequestration, studying its composition, sources and stability mechanism is a key to deeply understand the functions of terrestrial ecosystem and how it will respond to climate changes. The recently-proposed concept of soil microbial Carbon Pump(MCP) emphasizes the importance of soil microbial anabolism and its contributions to soil carbon formation and stabilization, which can be applied for elucidating the source, formation and sequestration of soil organic carbon. This article elaborates MCP-mediated soil carbon sequestration mechanism and its influencing factors, as well as representative scientific questions we may explore with the soil MCP conceptual framework.

关键词： Soil microbial Carbon Pump Entombing Effect Carbon cycling Soil microorganisms Soil organic carbon microbial residues Amino sugars Soil fauna

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